 OK, so let's start with this first problem. It'll be this one. So what is the frequency and hertz of a radar wave with the wavelength of 10.3 centimeters? So let's go ahead and do that problem. So of course, you're going to need to recall, well, I'll give you C. So that's 3.50. Times 10 to the second. It gives you the wavelength centimeters. And we're looking for the frequency. So like I was about to say, going to need to recall the formula that gets all these things together. So what is that? C equals B or lambda times frequency, right? Then we can rearrange this formula, hopefully, to solve for nu. So when we do that, it's going to be C divided by lambda. The other thing I hope you notice is that this is in centimeters and this is in meters. So we're going to have to do some sort of conversion. So let's write this thing out. So remember, we can also think about this like C times 1 over lambda. Sometimes that helps out with thinking about it that way. So 3.00 times 10 to the 8 meters per 1 second is C centimeters. It's 1 over lambda. So notice meters and centimeters aren't going to cancel each other out. So just multiply by the conversion factor that you know, 100 centimeters and 1 meter. So when we do that, meters cancel with their centimeters cancel there. And we're left with per seconds. So remember, it asks us what's the frequency in hertz, right? Well, hertz is this. And if you recall, it's just another way of writing per second, OK? So if I can find my calculator, since it's my first problem of the day, let's just go ahead and plug it in, right? So 3.00 times 100 divided by 10.30. And this equals some number, 2.00, whatever. So it's going to go to 3.00, 2.91 times 10 to the 9.00. Per second, OK? And remember, again, per second is just per pulse. So 2.91 times 10 to the 9.00. Check forward. Hopefully, you can do those ones. Bye now.